1 ;;; lib-complete.el --- Completion on the lisp search path
3 ;; Copyright (C) 1997 Free Software Foundation, Inc.
4 ;; Copyright (C) Mike Williams <mike-w@cs.aukuni.ac.nz> 1991
6 ;; Author: Mike Williams <mike-w@cs.aukuni.ac.nz>
7 ;; Maintainer: XEmacs Development Team
8 ;; Keywords: lisp, extensions, dumped
9 ;; Created: Sat Apr 20 17:47:21 1991
11 ;; This file is part of XEmacs.
13 ;; XEmacs is free software; you can redistribute it and/or modify it
14 ;; under the terms of the GNU General Public License as published by
15 ;; the Free Software Foundation; either version 2, or (at your option)
18 ;; XEmacs is distributed in the hope that it will be useful, but
19 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 ;; General Public License for more details.
23 ;; You should have received a copy of the GNU General Public License
24 ;; along with XEmacs; see the file COPYING. If not, write to the
25 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
26 ;; Boston, MA 02111-1307, USA.
28 ;;; Synched up with: Not in FSF.
32 ;; This file is dumped with XEmacs.
34 ;; ========================================================================
35 ;; lib-complete.el -- Completion on a search path
36 ;; Author : Mike Williams <mike-w@cs.aukuni.ac.nz>
37 ;; Created On : Sat Apr 20 17:47:21 1991
38 ;; Last Modified By: Heiko M|nkel <muenkel@tnt.uni-hannover.de>
39 ;; Additional XEmacs integration By: Chuck Thompson <cthomp@cs.uiuc.edu>
40 ;; Last Modified On: Thu Jul 1 14:23:00 1994
41 ;; RCS Info : $Revision: 1.3.2.1 $ $Locker: $
42 ;; ========================================================================
43 ;; NOTE: XEmacs must be redumped if this file is changed.
45 ;; Copyright (C) Mike Williams <mike-w@cs.aukuni.ac.nz> 1991
47 ;; Keywords: utility, lisp
49 ;; Many thanks to Hallvard Furuseth <hallvard@ifi.uio.no> for his
50 ;; helpful suggestions.
52 ;; The function locate-file is removed, because of its incompatibility
53 ;; with the buildin function of the lemacs 19.10 (Heiko M|nkel).
55 ;; There is now the new function find-library in this package.
59 ;; 4/26/97: sb Mule-ize.
63 ;;=== Determine completions for filename in search path ===================
65 (defun library-all-completions (FILE SEARCH-PATH &optional FULL FAST)
66 "Return all completions for FILE in any directory on SEARCH-PATH.
67 If optional third argument FULL is non-nil, returned pathnames should be
68 absolute rather than relative to some directory on the SEARCH-PATH.
69 If optional fourth argument FAST is non-nil, don't sort the completions,
70 or remove duplicates."
71 (setq FILE (or FILE ""))
72 (if (file-name-absolute-p FILE)
73 ;; It's an absolute file name, so don't need SEARCH-PATH
75 (setq FILE (expand-file-name FILE))
76 (file-name-all-completions
77 (file-name-nondirectory FILE) (file-name-directory FILE)))
78 (let ((subdir (file-name-directory FILE))
79 (file (file-name-nondirectory FILE))
81 ;; Make list of completions in each directory on SEARCH-PATH
83 (let* ((dir (concat (file-name-as-directory
84 (expand-file-name (car SEARCH-PATH)))
86 (dir-prefix (if FULL dir subdir)))
87 (if (file-directory-p dir)
88 (let ((subdir-completions
89 (file-name-all-completions file dir)))
90 (while subdir-completions
92 (cons (concat dir-prefix (car subdir-completions))
94 (setq subdir-completions (cdr subdir-completions))))))
95 (setq SEARCH-PATH (cdr SEARCH-PATH)))
96 (if FAST all-completions
97 (let ((sorted (nreverse (sort all-completions 'string<)))
100 (if (equal (car sorted) (car compressed)) nil
101 (setq compressed (cons (car sorted) compressed)))
102 (setq sorted (cdr sorted)))
105 ;;=== Utilities ===========================================================
107 (defmacro progn-with-message (message &rest forms)
108 "(progn-with-message MESSAGE FORMS ...)
109 Display MESSAGE and evaluate FORMS, returning value of the last one."
110 ;; based on Hallvard Furuseth's funcall-with-message
111 `(if (eq (selected-window) (minibuffer-window))
113 (goto-char (point-max))
114 (let ((orig-pmax (point-max)))
117 (insert " " ,message) (goto-char orig-pmax)
118 (sit-for 0) ; Redisplay
120 (delete-region orig-pmax (point-max)))))
122 (message "%s" ,message)
126 (put 'progn-with-message 'lisp-indent-hook 1)
128 ;;=== Completion caching ==================================================
130 (defconst lib-complete:cache nil
131 "Used within read-library and read-library-internal to prevent
132 costly repeated calls to library-all-completions.
133 Format is a list of lists of the form
135 ([<path> <subdir>] <cache-record> <cache-record> ...)
137 where each <cache-record> has the form
139 (<root> <modtimes> <completion-table>)")
141 (defun lib-complete:better-root (ROOT1 ROOT2)
142 "Return non-nil if ROOT1 is a superset of ROOT2."
143 (and (equal (file-name-directory ROOT1) (file-name-directory ROOT2))
145 (concat "^" (regexp-quote (file-name-nondirectory ROOT1)))
148 (defun lib-complete:get-completion-table (FILE PATH FILTER)
149 (let* ((subdir (file-name-directory FILE))
150 (root (file-name-nondirectory FILE))
153 (function (lambda (dir) (file-name-as-directory
154 (expand-file-name (or dir "")))))
156 (key (vector PATH subdir FILTER))
159 (mapcar (function (lambda (dir) (concat dir subdir))) PATH)
163 (function (lambda (fn) (if fn (nth 5 (file-attributes fn)))))
165 (cache-entry (assoc key lib-complete:cache))
166 (cache-records (cdr cache-entry)))
167 ;; Look for cached entry
171 (lib-complete:better-root (nth 0 (car cache-records)) root)
172 (equal (nth 1 (car cache-records)) path-modtimes))
173 (throw 'table (nth 2 (car cache-records))))
174 (setq cache-records (cdr cache-records)))
175 ;; Otherwise build completions
176 (let ((completion-list
177 (progn-with-message "(building completion table...)"
178 (library-all-completions FILE PATH nil 'fast)))
179 (completion-table (make-vector 127 0)))
180 (while completion-list
183 (file-directory-p (car completion-list)))
184 (car completion-list)
185 (funcall FILTER (car completion-list)))))
187 (intern completion completion-table)))
188 (setq completion-list (cdr completion-list)))
189 ;; Cache the completions
190 (lib-complete:cache-completions key root
191 path-modtimes completion-table)
194 (defvar lib-complete:max-cache-size 40
195 "*Maximum number of search paths which are cached.")
197 (defun lib-complete:cache-completions (key root modtimes table)
198 (let* ((cache-entry (assoc key lib-complete:cache))
199 (cache-records (cdr cache-entry))
200 (new-cache-records (list (list root modtimes table))))
201 (if (not cache-entry) nil
202 ;; Remove old cache entry
203 (setq lib-complete:cache (delq cache-entry lib-complete:cache))
204 ;; Copy non-redundant entries from old cache entry
206 (if (or (equal root (nth 0 (car cache-records)))
207 (lib-complete:better-root root (nth 0 (car cache-records))))
209 (setq new-cache-records
210 (cons (car cache-records) new-cache-records)))
211 (setq cache-records (cdr cache-records))))
212 ;; Add entry to front of cache
213 (setq lib-complete:cache
214 (cons (cons key (nreverse new-cache-records)) lib-complete:cache))
216 (let ((tail (nthcdr lib-complete:max-cache-size lib-complete:cache)))
217 (if tail (setcdr tail nil)))))
219 ;;=== Read a filename, with completion in a search path ===================
220 (defvar read-library-internal-search-path)
222 (defun read-library-internal (FILE FILTER FLAG)
224 ;; Relies on read-library-internal-search-path being let-bound
225 (let ((completion-table
226 (lib-complete:get-completion-table
227 FILE read-library-internal-search-path FILTER)))
229 ((not completion-table) nil)
230 ;; Completion table is filtered before use, so the PREDICATE
231 ;; argument is redundant.
232 ((eq FLAG nil) (try-completion FILE completion-table nil))
233 ((eq FLAG t) (all-completions FILE completion-table nil))
234 ((eq FLAG 'lambda) (and (intern-soft FILE completion-table) t))
237 (defun read-library (PROMPT SEARCH-PATH &optional DEFAULT MUST-MATCH
239 "Read library name, prompting with PROMPT and completing in directories
240 from SEARCH-PATH. A nil in the search path represents the current
241 directory. Completions for a given search-path are cached, with the
242 cache being invalidated whenever one of the directories on the path changes.
243 Default to DEFAULT if user enters a null string.
244 Optional fourth arg MUST-MATCH non-nil means require existing file's name.
245 Non-nil and non-t means also require confirmation after completion.
246 Optional fifth argument FULL non-nil causes a full pathname, rather than a
247 relative pathname, to be returned. Note that FULL implies MUST-MATCH.
248 Optional sixth argument FILTER can be used to provide a function to
249 filter the completions. This function is passed the filename, and should
250 return a transformed filename (possibly a null transformation) or nil,
251 indicating that the filename should not be included in the completions."
252 (let* ((read-library-internal-search-path SEARCH-PATH)
253 (library (completing-read PROMPT 'read-library-internal
254 FILTER (or MUST-MATCH FULL) nil)))
256 ((equal library "") DEFAULT)
257 (FULL (locate-file library read-library-internal-search-path
258 '(".el" ".el.gz" ".elc")))
261 ;; NOTE: as a special case, read-library may be used to read a filename
262 ;; relative to the current directory, returning a *relative* pathname
263 ;; (read-file-name returns a full pathname).
265 ;; eg. (read-library "Local header: " '(nil) nil)
267 (defun get-library-path ()
268 "Front end to read-library"
269 (read-library "Find Library file: " load-path nil t t
270 (function (lambda (fn)
272 ;; decompression doesn't work with mule -slb
273 ((string-match (if (featurep 'mule)
275 "\\.el\\(\\.gz\\)?$") fn)
276 (substring fn 0 (match-beginning 0))))))
279 ;;=== Replacement for load-library with completion ========================
281 (defun load-library (library)
282 "Load the library named LIBRARY.
283 This is an interface to the function `load'."
285 (list (read-library "Load Library: " load-path nil nil nil
286 (function (lambda (fn)
288 ((string-match "\\.elc?$" fn)
289 (substring fn 0 (match-beginning 0))))))
293 ;;=== find-library with completion (Author: Heiko Muenkel) ===================
295 (defun find-library (library &optional codesys)
296 "Find and edit the source for the library named LIBRARY.
297 The extension of the LIBRARY must be omitted.
298 Under XEmacs/Mule, the optional second argument specifies the
299 coding system to use when decoding the file. Interactively,
300 with a prefix argument, you will be prompted for the coding system."
302 (list (get-library-path)
303 (if current-prefix-arg
304 (read-coding-system "Coding System: "))))
305 (find-file library codesys))
307 (defun find-library-other-window (library &optional codesys)
308 "Load the library named LIBRARY in another window.
309 Under XEmacs/Mule, the optional second argument specifies the
310 coding system to use when decoding the file. Interactively,
311 with a prefix argument, you will be prompted for the coding system."
313 (list (get-library-path)
314 (if current-prefix-arg
315 (read-coding-system "Coding System: "))))
316 (find-file-other-window library codesys))
318 (defun find-library-other-frame (library &optional codesys)
319 "Load the library named LIBRARY in a newly-created frame.
320 Under XEmacs/Mule, the optional second argument specifies the
321 coding system to use when decoding the file. Interactively,
322 with a prefix argument, you will be prompted for the coding system."
324 (list (get-library-path)
325 (if current-prefix-arg
326 (read-coding-system "Coding System: "))))
327 (find-file-other-frame library codesys))
329 ; This conflicts with an existing binding
330 ;(define-key global-map "\C-xl" 'find-library)
331 (define-key global-map "\C-x4l" 'find-library-other-window)
332 (define-key global-map "\C-x5l" 'find-library-other-frame)
334 (provide 'lib-complete)
336 ;;; lib-complete.el ends here